// Package testing provides test helpers that support fiber templates
package templatetesting

import (
	"bytes"
	"html/template"
	"io/fs"
	"strings"
	"testing"

	"git.sapphic.engineer/roleypoly/v4/templates"
)

var (
	funcMap = template.FuncMap{
		"embed": func() string {
			return "%%EMBED%%"
		},
	}
	Templates *template.Template = template.New("index").Funcs(funcMap)
)

func init() {
	fs.WalkDir(templates.FS, ".", func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}

		if d.IsDir() {
			return nil
		}

		fiberName := strings.Replace(path, ".html", "", 1)
		f, err := templates.FS.ReadFile(path)
		if err != nil {
			return err
		}

		if fiberName == "index" {
			Templates, err = Templates.Parse(string(f))
		} else {
			_, err = Templates.New(fiberName).Parse(string(f))
		}

		return err
	},
	)

}

func Template(t *testing.T, name string, data interface{}) string {
	buf := bytes.Buffer{}
	err := Templates.ExecuteTemplate(&buf, name, data)
	if err != nil {
		debugTemplates(t)
		t.Fatal("failed to render: ", err)
	}

	return buf.String()
}

func debugTemplates(t *testing.T) {
	for i, tmpl := range Templates.Templates() {
		t.Logf("template %d: name=%s", i, tmpl.Name())
	}
}